Attrition-mill.



F. HAMAGHEK.

ATTBITION MILL.

APPLICATION FILED JAN.9, 1911.

Patented Mar. 31, 191i pig? UNiiTED STAEESPATENT orricn.

FRANK HAMACHEK, 0F KEWAUNEE, WISCONSIN.

ATTRITION-MILL.

To all whom it may concern Be it known that I, FRANK HAMACI-IEK, a citizen of the United States, residing in Kewaunee, in the county of Kewaunee and State of Wisconsin, have invented new and useful Improvements in Attrition-Mills, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

This invention relates to improvements in attrition mills and more particularly to grinding plates which are removably C011? nected to the oppositely rotating disks of an attrition or grinding mill.

In grinding grain or other cereals it is very important to grind the grain with a shearing cut and to reduce the grain as gradually as possible in order to avoid heating. If the grain is crushed or rubbed apart in grinding, it becomes overheated and loses its proper taste and strength. Grain thus ground will not easily absorb water or other liquids and is not desirable as a food product- It is one of the objects of this invention to provide attrition mill plates which will reduce grain with a shearing cut and without crushing or heating.

A further object of this invention is to provide attrition mill plates which are so constructed that the kernels of grain will be engaged by the grinding faces of the plates as soon as they enter the space there between and the kernels will be gradually reduced in size as they move outwardly toward the discharging peripheries of the plates.

A further object of the invention is to provide attrition mill plates in which the grinding ridges of the plate are cut or notched transversely to increase the capacity of the plates and to prevent overheating of the grain ground thereby.

A further object of the invention is to provide attrition mill plates in which the feed guide portions of the plates will feed and also cut the kernels of grain into smallerparticles before they pass between the grinding ridges of the plates.

A further object of the invention is to Specification of Letters Patent.

Application filed January 9, 1911.

Patented Mar. 31, 1914.

Serial No. 601,638.

provide attrition mill plates in which the guide and ridge portions of the plates are formed with one straight side and one beveled side so that when in use and positioned opposite with relation to each other and rotating in opposite directions, the straight edges of each plate will work against the straight edges of the opposite plate and the beveled portions of the guides and ridges are so shaped as to prevent interlocking in case the plates are inadvertently adjusted too closely together.

A further object of the invention is to construct an attrition mill plate in which the outer grinding face of the plate is provided with a circumferential line of notched grinding ridges or teeth which are closer together than the ridges or teeth of the other portions of the plate.

With the above, and other objects in view, the invention consists of the attrition mill plate and its parts and combinations as set forth in the claims, and all equivalents thereof.

In the accompanying drawing in which the same reference characters indicate the same parts in all of the views Figure 1 is a face view of a portion of the improved at trition mill plate; Fig. 2 is a transverse sectional view thereof taken on line 22 of Fig. 1; Fig. 3 is a sectional view thereof taken longitudinally of the grinding ridges and on line 33 of Fig. 1, said view also showing in dotted line another plate; and Fig. 4 is a sectional detail taken on line H of Fig. 1.

Referring to the drawing the numeral 8 indicates a fragment of one of a pair of annular attrition mill plates which are adapted to be fastened to the opposite heads or disks of the attrition mill by screws 9. The working face of the plate is provided with ridge portions or teeth 10, 11 and 12 respectively which extend tangentially with relation to a circle drawn around the axis of rotation of the plate, or in other words recede from the direction of rotation of the plate. The working edges of the ridges or teeth 10 extend in straight lines from end to end whereas the teeth 11 curve outwardly from the inner periphery of the plate and l the teeth between the teeth 11 and 10 curve to a less degree in approximately regular order toward the straight teeth 10. This arrangement of the teeth forms entrance spaces or depressions 13 between the plates, when assembled in pairs, for feeding grain thereto. In transverse section the side edge faces 1 1 of the teeth in the direction of rotation of the plates extend at right angles with relation to the plate and the front faces 15 thereof extend at an angle from the highest edges to the depressed side edges of said teeth so that when two like plates are oppositely positioned and rotated in opposite directions a shearing out between said edges will be produced.

In order to prevent the grain from shdmg outwardly when in engagement with the advancing edges of the teeth of the opposite plates the said teeth are cut or notched at a plurality of points forming recesses 16 the shoulders 17 of which serve to hold the kernels of grain while it is being cut. The recesses are staggered with relation to the recesses of adjacent teeth to prevent the kernels from passing from one recess to another without being out and to avoid the formation of continuous circumferential recesses or grooves. The circumferential line of teeth 12 which are also provided with the recesses 16 and shoulders 17 are placed closertogether to grind the grain to the fineness desired.

In use the plates are fastened to the opposite heads or disks of an attrition mill and in grinding the grain which is fed to the mill will pass into the entrance spaces or depressions and will be immediately acted upon by the teeth and partly out with a shearing cut and as the partly cut grain is gradually working outwardly by centrifugal force it will be gradually ground finer and finer until it finally passes out between the plates. In passing between the plates the kernels of grain will lodge in the recesses and will be held by the shoulders thereof until they are cut and the cut particles will then pass outwardly and lodge in the other recesses and will again be cut and this! operation will be repeated until the grain is finally discharged from the circumferential line of finer teeth.

While the plates have been described in connection with an attrition mill having oppositely rotating disks it is obvious that they may be used in a mill in which only one of the plates rotates and the other is stationary.

.From the foregoing description it will be seen that attrition mill plates are provided which will grind the grain without heating or crushing with the result that a more desiiable and-nutritious food is produced.

Vhat I claim as my invention is:

1. An attrition mill plate, comprising a plate having teeth formed on the working face thereof which extend in lines receding longitudinally away from the direction of rotation of the plate, the front faces of said teeth extending at an angle from the ad vancing edges to the depressed portions thereof, said teeth being recessed transversely approximately at right angles at a plurality of points to form a greater number of shearing edges, the transverse recesses being of less width than the grain kernels to be ground to hold said kernels while being ground.

2. An attrition mill plate, comprising a plate having teeth formed on the working face thereof which extend in lines receding longitudinally away from the direction of rotation of the plate, portions of some of said teeth being depressed lower than other portions to form entrance spaces for material to be ground, said teeth being recessed transversely approximately at right angles at a plurality of points to form a greater number of shearing edges, the transverse recesses being of less width than the grain kernels to be ground to hold said kernels while being ground.

3. An attrition mill plate, comprising a plate having teeth formed on the working face thereof which extend in longitudinal lines receding away from the direction of rotation of the plate, portions of some of said teeth being depressed lower than other portions to form a plurality of entrance spaces extending around the plate for the entrance of material to be ground, said teeth being recessed transversely approximately at right angles at a plurality of points to form a greater number of shearing edges, the transverse recesses being of less width than the grain kernels to be ground to hold said kernels while being ground, and a circumferential line of teeth formed on the face of the plate near the outer periphery thereof, said last mentioned teeth being recessed transversely and of less size than the first mentioned teeth.

4:. An attrition mill plate, comprising a plate having teeth formed on the working face thereof which extend tangentially in approximately straight lines receding away from the direction of rotation of the plate, portions of some of said teeth being depressed lower than other portions to form a plurality of material entrance spaces extending around the plate, said teeth being recessed transversely at a plurality of points to form a greater number of shearing edges, the transverse recesses being of less width than the grain kernels to be ground to hold said kernels while being ground, said transverse recesses also decreasing in width t0- In testimony whereof, I afiix my signa- Ward their rear ends, and a circumferential ture, in presence of two Witnesses.

line of teeth formed on the face of the plate 7 near the outer periphery thereof, said last FRANK HAMACHEK' mentioned teeth being recessed transversely Witnesses:

and of less size than the first mentioned F. HAMACHEK,JI., teeth. V. H. J ANDA.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G." 

